New Industry Products

Murata Unveils Miniature Power Supplies Aimed at Medical and Industrial Applications

April 04, 2022 by Gary Elinoff

The new 1000 W, single output open frame AC/DC converters meet stringent medical safety requirements.

Murata Power Solutions, the Massachusetts-based division of global electronics manufacturer Murata, announced March 29 that it had expanded its PQ line of open frame AC/DC converters with the new PQU1000 series. 

The series' supplies feature primary outputs of 12, 24, 48 or 54 V and meet EC62368-1 and EN60601-1 third edition standards for industrial and healthcare applications.


The PQU1000 series. Screenshot [modified] used courtesy of Murata Power Solutions


The new devices satisfy requirements for 2 x MOPP (means of patient protection) between primary and secondary, and 1 x MOPP between primary and chassis ground, making them suitable for Body Floating (BF) applications.

Optimized for free-air convection cooling, the new units are also suitable for use in low-noise environments. Members of the PQU series achieve efficiencies of 95%, and can deliver up to 800 W at 45 °C with convection cooling alone. In forced hot air setups, they can provide up to 1000 W at up to 50 °C.


PQU1000 Series Members 

The series’ supplies all operate over inputs ranging from 90 to 264 VAC. All units offer a 5 V, 0.5 A auxiliary output, and units designated for deployment with forced air cooling feature a 12 V, 0.6 A power supply for the fan.  The 5 and 12 V outputs can handle capacitive loads of up to 220 uF.

The four members of the series, and their single output voltages are as follows:

  • PQU1000-12: 12 V output
  • PQU1000-24: 24 V output
  • PQU1000-48: 48 V output
  • PQU1000-54: 54 V output

The 12, 24 and 48 V devices sport single output voltages that are adjustable to within -5% and +10% of their nominal values. The adjustment range of the 54 V PQU1000-54 is ±5%.


Current Sharing

Members of the PQU1000 power module series feature active current sharing. This allows for connection of the units in either non-redundant parallel, or parallel redundant deployments. Equal current share is maintained between the devices.


Important Specifications

Communication and Sensing

  • Communication with the series member is simplified via an available power management bus (PMBus) protocol
  • There is remote sensing for the main output


  • There are no minimum power load requirements
  • Power factor is 0.95
  • At 90 VAC, target hold up time is 10 ms
  • Transient response for a 50% load step is ±5%
  • Output voltage settling time to 1% of nominal value is 2 ms
  • Turn on delay after input power is applied is 3 sec


  • Primary to Chassis: 1500 VAC
  • Primary to Secondary (2 x MOPP): 4800 VAC
  • Secondary to Chassis: 1500 VAC
  • Main Output to 12 V and or 5 V outputs: 1500 VAC



  • Healthcare applications, including:
    – Hospital bed sensing
    – Ventilators
    – Blood analysis equipment
  • Factory automation
  • 3D printing
  • Displays
  • Test and measurement
  • Broadcast
  • Power over Ethernet (PoE)


Physical Considerations

The devices all feature 127 x 203.2 mm (5 x 8 inch) industry standard footprints with a “U” channel form factor, as well as industry standard mounting footprints.


A schematic of the PQU1000 series' dimensions and layout. Screenshot used courtesy of Murata Power Solutions



  • 39.97 mm maximum overall “U” Channel height
  • 45.60 mm nominal overall height with cover
  • 67.93 mm nominal overall height with integral fan cover


EMC Compliance

PDU series members are designed to comply with IEC60601-2 4th edition EMC standard requirements 


Environmental Notes

Members of the PQU100 series are RoHS-compliant


Feature image used courtesy of Murata Power Solutions